Cops and Robbers is a 1973 film directed by Aram Avakian and written by Donald E. Westlake based upon his own novel. The film stars Cliff Gorman as Tom and Joseph Bologna as Joe.
Tom and Joe are disillusioned New York cops who decide to pull off one big robbery in their uniforms and retire on the proceeds. Bearer bonds are what the local Mafia boss will buy, so that's what they go for. Central Park is the location for the switch. Can they come out of it with their lives and the money?
Roger Greenspun wrote a favorable review of the film for the New York Times.
(This is information generated from a Wikipedia article, licensed under the GNU Free Documentation License.)